[Chin numbness as initial manifestation of systemic cancer].

This issue describe the clinical picture of a man who consulted by hypoanaesthesia in the chin area that was secondary to a lung cancer. The most common primary cancers associated with mental neuropathy are haematological malignancies, breast and lung cancers. The presence o mental neuropathy must not be considered an "banal" symptom. It should be quickly recognised in order to research the presence of cancer.